Physical and Chemical Changes

Front

What is a physical change?

Back

A physical change is a change that affects one or more physical properties of a substance without altering its chemical composition. Examples include melting, freezing, and breaking.

Front

What is a chemical change?

Back

A chemical change is a change that results in the formation of new chemical substances. It involves a chemical reaction and changes the chemical composition of the substance. Examples include burning, rusting, and spoiling.

Front

Is burning wood a chemical or physical change?

Back

Chemical change.

Front

Is a rusting bicycle a chemical or physical change?

Back

Chemical change.

Front

Is glass breaking a chemical or physical change?

Back

Physical change.

Front

Is spoiling food a physical or chemical change?

Back

Chemical change.

Front

What are some indicators of a chemical change?

Back

Indicators of a chemical change include color change, temperature change, gas production, and the formation of a precipitate.

Front

What are some examples of physical changes?

Back

Examples of physical changes include melting ice, boiling water, dissolving sugar in water, and breaking a glass.

Front

What happens to the molecules during a physical change?

Back

During a physical change, the arrangement of molecules may change, but their chemical structure remains the same.

Front

What happens to the molecules during a chemical change?

Back

During a chemical change, the bonds between molecules are broken and new bonds are formed, resulting in new substances.